Von Willebrand Disease
Von Willebrand disease (VWD) is a bleeding disorder. It affects your blood's ability to clot. If your blood doesn't clot, you can have heavy, hard-to-stop bleeding after an injury. The bleeding can damage your internal organs. Rarely, the bleeding may even cause death.
In VWD, you either have low levels of a certain protein in your blood or the protein doesn't work well. The protein is called von Willebrand factor, and it helps your blood clot.
Normally, when one of your blood vessels is injured, you start to bleed. Small blood cell fragments called platelets (PLATE-lets) clump together to plug the hole in the blood vessel and stop the bleeding. Von Willebrand factor acts like glue to help the platelets stick together and form a blood clot.
Von Willebrand factor also carries clotting factor VIII (8), another important protein that helps your blood clot. Factor VIII is the protein that's missing or doesn't work well in people who have hemophilia, another bleeding disorder.
VWD is more common and usually milder than hemophilia. In fact, VWD is the most common inherited bleeding disorder. It occurs in about 1 out of every 100 to 1,000 people. VWD affects both males and females, while hemophilia mainly affects males.
Types of von Willebrand Disease
The three major types of VWD are called type 1, type 2, and type 3.
People who have type 1 VWD have low levels of von Willebrand factor and may have low levels of factor VIII. Type 1 is the mildest and most common form of VWD. About 3 out of 4 people who have VWD have type 1.
In type 2 VWD, the von Willebrand factor doesn't work well. Type 2 is divided into subtypes: 2A, 2B, 2M, and 2N. Different gene mutations (changes) cause each type, and each is treated differently. Thus, it's important to know the exact type of VWD that you have.
People who have type 3 VWD usually have no von Willebrand factor and low levels of factor VIII. Type 3 is the most serious form of VWD, but it's very rare.
Most people who have VWD have type 1, a mild form. This type usually doesn't cause life-threatening bleeding. You may need treatment only if you have surgery, tooth extraction, or trauma. Treatment includes medicines and medical therapies.
Some people who have severe forms of VWD need emergency treatment to stop bleeding before it becomes life threatening.
Early diagnosis is important. With the proper treatment plan, even people who have type 3 VWD can live normal, active lives.
Von Willebrand disease (VWD) is almost always inherited. "Inherited" means that the disorder is passed from parents to children though genes.
You can inherit type 1 or type 2 VWD if only one of your parents passes the gene on to you. You usually inherit type 3 VWD only if both of your parents pass the gene on to you. Your symptoms may be different from your parents' symptoms.
Some people have the genes for the disorder but don't have symptoms. However, they still can pass the genes on to their children.
Some people get VWD later in life as a result of other medical conditions. This type of VWD is called acquired von Willebrand syndrome.
Signs, Symptoms, and Complications
The signs and symptoms of von Willebrand disease (VWD) depend on which type of the disorder you have. They also depend on how serious the disorder is. Many people have such mild symptoms that they don't know they have VWD.
If you have type 1 or type 2 VWD, you may have the following mild-to-moderate bleeding symptoms:
- Frequent, large bruises from minor bumps or injuries
- Frequent or hard-to-stop nosebleeds
- Prolonged bleeding from the gums after a dental procedure
- Heavy or prolonged menstrual bleeding in women
- Blood in your stools from bleeding in your intestines or stomach
- Blood in your urine from bleeding in your kidneys or bladder
- Heavy bleeding after a cut or other accident
- Heavy bleeding after surgery
People who have type 3 VWD may have all of the symptoms listed above and severe bleeding episodes for no reason. These bleeding episodes can be fatal if not treated right away. People who have type 3 VWD also may have bleeding into soft tissues or joints, causing severe pain and swelling.
Heavy menstrual bleeding often is the main symptom of VWD in women. Doctors call this menorrhagia (men-o-RA-je-ah). They define it as:
- Bleeding with clots larger than about 1-inch in diameter
- Anemia (low red blood cell count) or low blood iron
- The need to change pads or tampons more than every hour
However, just because a woman has heavy menstrual bleeding doesn't mean she has VWD.
Early diagnosis of von Willebrand disease (VWD) is important to make sure that you're treated and can live a normal, active life.
Sometimes VWD is hard to diagnose. People who have type 1 or type 2 VWD may not have major bleeding problems. Thus, they may not be diagnosed unless they have heavy bleeding after surgery or some other trauma.
On the other hand, type 3 VWD can cause major bleeding problems during infancy and childhood. So, children who have type 3 VWD usually are diagnosed during their first year of life.
To find out whether you have VWD, your doctor will review your medical history and the results from a physical exam and tests.
Your doctor will likely ask questions about your medical history and your family's medical history. He or she may ask about:
- Any bleeding from a small wound that lasted more than 15 minutes or started up again within the first 7 days following the injury.
- Any prolonged, heavy, or repeated bleeding that required medical care after surgery or dental extractions.
- Any bruising with little or no apparent trauma, especially if you could feel a lump under the bruise.
- Any nosebleeds that occurred for no known reason and lasted more than 10 minutes despite pressure on the nose, or any nosebleeds that needed medical attention.
- Any blood in your stools for no known reason.
- Any heavy menstrual bleeding (for women). This bleeding usually involves clots or lasts longer than 7 to 10 days.
- Any history of muscle or joint bleeding.
- Any medicines you've taken that might cause bleeding or increase the risk of bleeding. Examples include aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs), clopidogrel, warfarin, or heparin.
- Any history of liver or kidney disease, blood or bone marrow disease, or high or low blood platelet counts.
Your doctor will do a physical exam to look for unusual bruising or other signs of recent bleeding. He or she also will look for signs of liver disease or anemia (a low red blood cell count).
No single test can diagnose VWD. Your doctor may recommend one or more blood tests to diagnose the disorder. These tests may include:
- Von Willebrand factor antigen. This test measures the amount of von Willebrand factor in your blood.
- Von Willebrand factor ristocetin (ris-to-SEE-tin) cofactor activity. This test shows how well your von Willebrand factor works.
- Factor VIII clotting activity. This test checks the clotting activity of factor VIII. Some people who have VWD have low levels of factor VIII activity, while others have normal levels.
- Von Willebrand factor multimers. This test is done if one or more of the first three tests are abnormal. It shows the structure of your von Willebrand factor. The test helps your doctor diagnose what type of VWD you have.
- Platelet function test. This test measures how well your platelets are working.
You may have these tests more than once to confirm a diagnosis. Your doctor also may refer you to a hematologist to confirm the diagnosis and for followup care. A hematologist is a doctor who specializes in diagnosing and treating blood disorders.
Treatment for von Willebrand disease (VWD) is based on the type of VWD you have and how severe it is. Most cases of VWD are mild, and you may need treatment only if you have surgery, tooth extraction, or an accident.
Medicines are used to:
- Increase the amount of von Willebrand factor and factor VIII released into the bloodstream
- Replace von Willebrand factor
- Prevent the breakdown of blood clots
- Control heavy menstrual bleeding in women
One treatment for VWD is a man-made hormone called desmopressin. You usually take this hormone by injection or nasal spray. It makes your body release more von Willebrand factor and factor VIII into your bloodstream. Desmopressin works for most people who have type 1 VWD and for some people who have type 2 VWD.
Another type of treatment is von Willebrand factor replacement therapy. This involves an infusion of concentrated von Willebrand factor and factor VIII into a vein in your arm. This treatment may be used if you:
- Can't take desmopressin or need extended treatment
- Have type 1 VWD that doesn't respond to desmopressin
- Have type 2 or type 3 VWD
Antifibrinolytic (AN-te-fi-BRIN-o-LIT-ik) medicines also are used to treat VWD. These medicines help prevent the breakdown of blood clots. They're mostly used to stop bleeding after minor surgery, tooth extraction, or an injury. These medicines may be used alone or with desmopressin and replacement therapy.
Fibrin glue is medicine that's placed directly on a wound to stop bleeding.
Treatments for Women
Treatments for women who have VWD with heavy menstrual bleeding include:
- Birth control pills. The hormones in these pills can increase the amount of von Willebrand factor and factor VIII in your blood. The hormones also can reduce menstrual blood loss. Birth control pills are the most recommended birth control method for women who have VWD.
- A levonorgestrel intrauterine device. This is a birth control device that contains the hormone progestin. The device is placed in the uterus (womb).
- Aminocaproic acid or tranexamic acid. These antifibrinolytic medicines can reduce bleeding by slowing the breakdown of blood clots.
For some women who are done having children or don't want children, endometrial ablation (EN-do-ME-tre-al ab-LA-shun) is done. This procedure destroys the lining of the uterus. It has been shown to reduce menstrual blood loss in women who have VWD.
If you need a hysterectomy (HIS-ter-EK-to-me; surgical removal of the uterus) for another reason, this procedure will stop menstrual bleeding and possibly improve your quality of life. However, hysterectomy has its own risk of bleeding complications.
If you have von Willebrand disease (VWD), you can take steps to prevent bleeding and stay healthy.
For example, avoid over-the-counter medicines that can affect blood clotting, such as aspirin, ibuprofen, and other nonsteroidal anti-inflammatory drugs (NSAIDs). Always check with your doctor before taking any medicines.
Tell your doctor, dentist, and pharmacist that you have VWD. Your dentist can ask your doctor whether you need medicine before dental work to reduce bleeding.
You also may want to tell other people about your condition, like your employee health nurse, gym trainer, and sports coach. Making them aware will allow them to act quickly if you have an injury.
Consider wearing a medical ID bracelet or necklace if you have a serious form of VWD (for example, type 3). In case of a serious accident or injury, the health care team treating you will know that you have VWD.
Be physically active and maintain a healthy weight. Physical activity helps keep muscles flexible. It also helps prevent damage to muscles and joints. Always stretch before exercising.
Some safe physical activities are swimming, biking, and walking. Football, hockey, wrestling, and lifting heavy weights are not safe activities if you have bleeding problems. Always check with your doctor before starting any exercise program.
Your parents, brothers and sisters, and children also may have VWD. Talk with them about your diagnosis and suggest that they get tested too.
Pregnancy and von Willebrand Disease
Pregnancy can be a challenge for women who have VWD. Blood levels of von Willebrand factor and factor VIII tend to increase during pregnancy. However, women who have VWD can have bleeding problems during delivery. They also are likely to have heavy bleeding for an extended time after delivery.
You can take steps to lower the risk of complications during pregnancy. If possible, talk with a hematologist and an obstetrician who specializes in high-risk pregnancies before you become pregnant.
A hematologist is a doctor who specializes in diagnosing and treating blood disorders. An obstetrician is a doctor who provides treatment and care for pregnant women.
Consider using a medical center that specializes in high-risk obstetrics and has a hematologist on staff for prenatal care and delivery.
Before you have any invasive procedure, such as amniocentesis (AM-ne-o-sen-TE-sis), discuss with your doctor whether you need to take steps to prevent serious blood loss.
During your third trimester, you should have blood tests to measure von Willebrand factor and factor VIII to help plan for delivery.
You also should meet with an anesthesiologist to review your choices for anesthesia (AN-es-THE-ze-ah) and to discuss taking medicine to reduce your bleeding risk. The term "anesthesia" refers to a loss of feeling and awareness. Some types of anesthesia temporarily put you to sleep, while others only numb certain areas of your body.
With these steps for safety, most women who have VWD can have successful pregnancies.
Children and von Willebrand Disease
If your child has VWD that's severe enough to cause bleeding, anyone who cares for him or her should be told about the condition.
For example, the school nurse, teacher, daycare provider, coach, or any leader of afterschool activities should know, especially if your child has severe VWD. This information will help them handle the situation if your child has an injury.
The National Heart, Lung, and Blood Institute (NHLBI) leads or sponsors many studies aimed at preventing, diagnosing, and treating heart, lung, blood, and sleep disorders.